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Simplify sign selection

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2021-06-10 09:36:41 +02:00
parent 3ae4ae445f
commit 31ec1d7319
1 changed files with 2 additions and 11 deletions
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13
library/bignum.c
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@ -257,17 +257,8 @@ static int mpi_safe_cond_select_sign( int a, int b, unsigned char second )
unsigned ua = a + 1;
unsigned ub = b + 1;
/* MSVC has a warning about unary minus on unsigned integer types,
* but this is well-defined and precisely what we want to do here. */
#if defined(_MSC_VER)
#pragma warning( push )
#pragma warning( disable : 4146 )
#endif
/* all-bits 1 if assign is 1, all-bits 0 if assign is 0 */
const unsigned mask = -second;
#if defined(_MSC_VER)
#pragma warning( pop )
#endif
/* second was 0 or 1, mask is 0 or 2 as are ua and ub */
const unsigned mask = second << 1;
/* select ua or ub */
unsigned ur = ( ua & ~mask ) | ( ub & mask );